Multi-residue Analysis of Fungicides in Strawberry / 日本農村医学会雑誌

ABSTRACT

The'Toyonoka' variety increased rapidly in the market of strawberry in southwest Japan. But this variety has no resistance to powdery mildew (Sphaerotheca hurnuli), and the farmers are at their wit's end, not knowing how to control the fungi.<BR>Multi-residue analytical method was established for 3 dicarboximides (vinclozolin, procymidone and iprodione) and 7 fungicides to control powdery mildew (triadimefon, pyrifenox, chinomethionate, fenarimol, myclobutanil, bitertanol and triflumizole). The recovery rates of 13 chemicals were 76-93%, and detection limits were below 0.01μg/g-raw with HPLC-DAD and GC-ECD.<BR>Nine fungicides except vinclozolin were detected in strawberries on the market, and 12 chemicals detected were qualified with HPLC-DAD and GC-MS. All the detected cases were below the maximum residue levels in Japan.<BR>Dicarboximides were detected 60-70% of strawberry samples both in ‘Toyonoka’ and ‘Nyohou’. On the other hand, the fungicides to control powdery mildew were detected often and complexly in ‘Toyonoka’ than ‘Nyohou’. It is necessary to consider to exchange the 'Toyonoka' variety for more tolerant one to control powdery mildew.